From: Jeff King <peff@peff.net>
Date: Thu, 14 Jan 2010 19:36:07 GMT
Subject: Re: Removal of post-upload-hook
Message-ID: <20100114193607.GB25863@coredump.intra.peff.net>
In-Reply-To: <6f8b45101001141001q40d8b746v8385bc6ae37a6af4@mail.gmail.com>

On Thu, Jan 14, 2010 at 11:31:57PM +0530, Arun Raghavan wrote:

> [I'm not on the list, so please CC me on replies]
> 
> Hello,
> I noticed that the post-upload hook had been removed in commit
> 1456b043fc0f0a395c35d6b5e55b0dad1b6e7acc. The commit message states:
> 
>     This hook runs after "git fetch" in the repository the objects are
>     fetched from as the user who fetched, and has security implications.
> 
> I was wondering if someone could shed some light (or links) on what
> security implications this hook has?

Because receive-pack runs as the user who is pushing, not as the
repository owner. So by convincing you to push to my repository in a
multi-user environment, I convince you to run some arbitrary code of
mine.

-Peff